Docker: npm.sap.com not accessible

[CCFenner]

Inside the Docker container npm.sap.com is not accessible due to an SSL. Issue and solution are also described in SAP/devops-docker-node-browsers#10 (comment).

Please provide the following info:

• MBT Version: as provided in Docker
• OS Version: as provided in Docker 1.0.1

Steps to Reproduce:

1. start container: docker run -it devxci/mbtci:1.0.1 bash
2. execute inside of container: cd ~ && npm install @sap/cds

current result:

npm ERR! code EPROTO
npm ERR! errno EPROTO
npm ERR! request to https://npm.sap.com/@sap%2fcds failed, reason: write EPROTO 140137535555456:error:1414D172:SSL routines:tls12_check_peer_sigalg:wrong signature type:../deps/openssl/openssl/ssl/t1_lib.c:1111:
npm ERR! 

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/mta/.npm/_logs/2019-11-28T12_56_02_985Z-debug.log

expected result:

+ @sap/cds@x.y.z